A striking 12th-century-style castle built on the edge of a cliff.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

A collection of abandoned typographic signs from Berlin and beyond.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

Ruins of a German Castle on top of a towering stone pillar.

The most visited, and possibly most controversial, museum in Germany.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

An eerie, derelict amusement park in Berlin.

A massive, abstract lookout tower providing a panoramic view of Prague.

One of the oldest, well-preserved water treatment facilities in all of Europe.

A Cold War secret surveillance tower used to spy on radio communications.

An unusual bronze bus shelter is actually an art installation commenting on the city's history with the Nazi party.

A giant interactive periodic table with real samples of the elements.

The 14th-century ruins are said to contain healing powers.

A massive 1830s industrial site once known as Czechia's "Iron Heart" has been transformed into a playground of science, technology, and art.

A series of playful yellow penguins share a serious message about the environment.

Enormous sandstone towers loom within a Czech forest.

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.